Pulping apparatus



Aug. 25, 1964 w. w. MONKS PULPING APPARATUS Filed May 29, 1961 IN V ENTOR. VVzZZz'awz WWII/9 BY ,gzzw %4 H77 VJ United States Patent 3,145,936PULPING APPARATUS William W. Monks, Pittsfield, Mass, assignor to E. D.Jones Corporation, Pittsfield, Mass, a corporation of Delaware Filed May29, 1961, Ser. No. 113,303 Claims. (Cl. 241-46) This invention relatesto defibering apparatus of the type described and claimed in Patent2,756,646, granted July 31, 1956, to Dwight E. Jones, which has a rotortapered toward its free end and circulating fins on its taperedperiphery. It has been found that the aforesaid end becomes plasteredwith large pieces of pulp which not only decreases the circulation ofmaterial but results in the aforesaid pieces not being properlydefibered. Thus when the plastered pulp is disengaged at a later stageof the pulping cycle it mixes with the defibered pulp and produces amixture which is not uniformly defibered. Moreover the mass of plasteredpulp sometimes falls off while emptying the tank and plugs the drain.

Objects of the present invention are to prevent the aforesaidplastering, to produce uniform defibering throughout each batch ofmaterial, to avoid the necessity of stopping the apparatus to removeplastered material, and to process pulp continuously without danger ofplastering.

In one aspect of the present invention the free end of the rotor isprovided with a protuberance and surrounding the protuberance is aspiral vane which progresses toward the outer end of the protuberance inthe direction opposite to the direction of rotation. Preferably theaxial protuberance is tapered toward its outer end and the vanegradually increases in width toward the outer end. Thus instead of thematerial being plastered on the face of the rotor it is maintained incirculation.

In another aspect of the invention the rotor is tapered toward its freeend and the aforesaid fins are fast to its tapered periphery, and theaforesaid spiral vane extends axially from the free end of the rotor,the spiral progress ing in the direction opposite to the direction ofrotation so as to pump material away from the free end of the rotor.

For the purpose of illustration a typical embodiment of the invention isshown in the accompanying drawings in which FIG. 1 is a plan view of aportion of a pulping tank;

FIG. 2 is an elevation of the aforesaid rotor viewed to a line 22 ofFIG. 1; and

FIG. 3 is a section on line 3--3 of FIG. 2.

In the illustration 1 is the pulping tank and 2 is the aforesaid rotor,corresponding to the parts 2 and 8 of the aforesaid patent. The rotor isdriven in the direction of the arrow 3 in FIG. 2 by means of a shaft 4and belt 5.

According to this invention the outer periphery 6 of the ice end of theprotuberance in a direction opposite to the direction of rotation, andthe width of the vane gradually increases from its inner end 10 to itsouter end 11. As shown in the drawings the fins 7 are wider and longerthan the fins 7.

From the foregoing it will be understood that the vane 9 serves as areverse screw which causes the pulp to flow away from the base of therotor instead of being plastered thereon.

It should be understood that the present disclosure is for the purposeof illustration only and that this invention includes all modificationsand equivalents which fall within the scope of the appended claims.

I claim:

1. In a machine for pulping material, a rotor having a free end andoutwardly projecting fins to produce circulation of material away fromthe axis of the rotor, and a spiral vane extending axially from saidend, the spiral progressing in the direction opposite to the directionof rotation from the rotor toward the tip of the vane so as to tend topump material away from said end along said axis.

2. In a machine for pulping material, a rotor to circulate the material,the rotor having peripheral fins and an axial protuberance, and a spiralvane around the protuberance, the spiral progressing toward the outerend of the protuberance in the direction opposite to the direction ofrotation.

3. In a machine for pulping material, a rotor to circulate the material,the rotor having peripheral fins and an axial protuberance which istapered toward its outer end, and a spiral vane around the taperedprotuberance, the spiral progressing toward said end in the directionopposite to the direction of rotation.

4. In a machine for pulping material, a rotor to circulate the material,the rotor having peripheral fins and an axial protuberance which istapered toward its outer end, and a spiral vane around the taperedprotuberance, the spiral progressing toward said end in the directionopposite to the direction of rotation and the vane gradually increasingin width toward said end.

5. In a machine for pulping material, a rotor to circulate the material,the rotor being tapered toward one end and having outwardly projectingfins on its tapered periphery, and a spiral vane extending axially fromsaid end, the spiral progressing in the direction opposite to thedirection of rotation from the rotor toward the tip of the vane so as totend to pump material away from said end along the axis of the rotor.

References Cited in the file of this patent UNITED STATES PATENTS2,434,449 Wells Jan. 13, 1948 2,756,646 Jones July 31, 1956 3,035,781Wallen May 22, 1962 FOREIGN PATENTS 190,786 Austria July 25, 1957602,511 Canada July 26, 1960

1. IN A MACHINE FOR PULPING MATERIAL, A ROTOR HAVING A FREE END ANDOUTWARDLY PROJECTING FINS TO PRODUCE CIRCULATION OF MATERIAL AWAY FROMTHE AXIS OF THE ROTOR, AND A SPIRAL VANE EXTENDING AXIALLY FROM SAIDEND, THE SPIRAL PROGRESSING IN THE DIRECTION OPPOSITE TO THE DIRECTIONOF ROTATION FROM THE ROTOR TOWARD THE TIP OF THE VANE SO AS TO TEND TOPUMP MATERIAL AWAY FROM SAID END ALONG SAID AXIS.